<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>bottom</title>
    <style>
      * {
        padding: 0px;
        margin: 0px;
      }

      .box {
        width: 200px;
        height: 200px;
        text-align: center;
        line-height: 200px;
        font-size: 20px;
        color: white;
      }

      .box1 {
        background-color: chocolate;
        position: absolute;
        bottom: 50px;
      }

      .box2 {
        background-color: rgb(61, 43, 31);
        position: absolute;
        left: 210px;
        bottom: 0px;
      }
    </style>
  </head>
  <body>
    <div class="box box1">bottom: 50px;</div>
    <div class="box box2">bottom: 0px;</div>
  </body>
</html>
